phytology vs inward-developing

phytology is a noun but inward-developing is not a noun.

Word	Noun	Adjective	Verb	Adverb
phytology	Yes	No	No	No
inward-developing	No	Yes	No	No

phytology (noun)	inward-developing (noun)
the branch of biology that studies plants

phytology (adjective)	inward-developing (adjective)
	toward an axis, as in a sunflower; the oldest flowers are near the edge, the youngest in the center